Tuesday, April 24, 2007

PACKED COLUMNA packed bed is a hollow tube or pipe that is filled with a packing material. The packing can be randomly filled small objects like Raschig rings or else it can be a specifically designed structured packing.

The purpose of a packed bed is typically to improve contact between two phases in a chemical or similar process. Packed beds can be used in a chemical reactor, distillation process, or a scrubber, but packed beds have also been used to store heat in chemical plants. In this case, hot gases are allowed to escape through a vessel that is packed with a refractory material until the packing is hot. Air or other cool gas is then fed back to the plant through the hot bed, thereby pre-heating the gas feed.

WHY PACKED COLUMN IS USED ?

Packed columns are preferred to tray columns

PROCESS WITH 2-PROCESS FLUIDS (liquid- gas, liquid-liquid, liquid-solid, liquid-vapor) are in contact and separation take place.

1 Comments:

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